I had the same DNS error in Mini Client, Google Chrome, and Firefox.
I could not access any oasisgame pages at all. (So I guess not everybody will be able to read your helping tutorial either.)

I came to this recommended solution by myself too, and this solved the problem for me.

Interesting additional info: somehow the web browser that came with the anti-virus program I use could cir*vent this and access the sites and game without any problem. XD I used that until I fixed it. :D